320 



forms of microscopes on board ship If they had the bodies separated on 

 the Jackson-Lister arm they would have the objective eyepiece and object 

 supported on the same part, and all would vibrate together. In the Ross 

 model the communication was down a long arm and a triangular bar 

 and back again. In the Powell and Leland pattern there was a certain 

 arrangement of small springs which got rid of vibration almost entirely, 

 but in all the smaller instruments there was a difficulty, and it made all the 

 difference which of the two models they had — the Jackson-Lister or the 

 Ross. Vibrations communicated equally were less trouble than those com- 

 municated unequally. This struck Dr. Carpenter, and it was certainly a 

 point of importance for consideration in the original selection of a microscope. 

 Votes of thanks to Mr. Smith for his communication, and to Mr. Karop 

 for introducing the subject for discussion, were passed, and the announce- 

 ments of meeting, &c, for the ensuing month having been made, the pro- 

 ceedings terminated with the usual conversazione, at which the following 

 objects were exhibited : — 



Anthers and pistil of Dahlia, with pollen tubes. 

 Acari, Dtrmalelchvs, from Red-tailed Boat- 



o it lUIl ••• ••• • • • ••• ••• 



Reflexed saws of Trichiosoma lucorum 

 Acarus, Molgus, found in hay ... 

 Section of Footpad of Elephant, polarized 

 Aphis, from Myrtle 



Eggs of Parasite of Rhinoceros Hornbill 

 Young Anemone, Sagartia bellis 



■} 



Mr. F. W. Andrew. 

 Mr. C. G. Dunning. 



Mr. F. Enock. 

 Mr. H. E. Freeman. 

 Mr. T. S. Morten. 

 Mr. J. Avelard. 

 Mr. C. Le Pelley. 

 Mr. H. J. Waddington. 



Attendance — Members, 55; Visitor, 1. 



October 12th, 1883. — Conversational Meeting. 



The following objects were exhibited : — 



Eggs of Silk Moth with larva emerging ... 



Young Sponge {Grantia ciliata) on ma.| 

 rine alga (Wrangelia multifolia) ) 



Sand from Desert between Moses' Wetl- 

 and Suez, rounded and polished by fric- 

 tion 



Drosera rotundi folia, alive, feeding on a fly 



Acari, Glycipliagus sjnnijies 



„ Qheyletus Venustissimus, alive, and 

 mounted 



Sections of Australian Woods, cut with a 

 picinG ••• ••• ••• 



Hamatoj)inus Suis 



Mr. F. W. Andrew. 

 Mr. T. W. Buffham. 



Mr. A. Button. 

 Mr. W. I. Curties. 

 Mr. H. E. Freeman. 



Mr. H. G. Glasspoole. 

 Mr. H. R. Gregory. 



